What is significance of Maa Kalaratri's worship on Day 7 of Navratri?

On the seventh day of Navratri, devotees worship Maa Kalaratri, seventh form of Goddess Durga. She's believed to protect devotees from evil spirits, negative energies and fear. Her worship is also associated with courage to face challenges and overcome darkness. According to spiritual beliefs, worshipping Maa Kalaratri activates Sahasrara (crown) chakra, leading to divine awakening and liberation.